They won't vanish, they will just become irrelevant. I see Facebook becoming like myspace in about 5 to 10 years but Microsoft won't disappear while everyone uses Windows.
Xbox One, PS4 and Switch (+ Many Retro Consoles)
'When the people are being beaten with a stick, they are not much happier if it is called the people's stick'- Mikhail Bakunin
Prediction: Switch will sell better than Wii U Lifetime Sales by Jan 1st 2018